Test Coverage UI running forever in some projects

[alanwilter]

Type: Bug

I can't really show an example. I have two projects here:

• one works fine, I click on "Run Tests With Coverage" and the decorators show up when all tests finish.
• in another project, I see TEST RESULTS finishing in a few seconds but the Decorators never come, the time counting keeps going forever. However, when I click to stop it (on the UI icon), it shows the decorators.

Extension version: 2025.16.0
VS Code version: Code 1.105.1 (7d842fb85a0275a4a8e4d7e040d2625abbf7f084, 2025-10-14T22:33:36.618Z)
OS version: Darwin arm64 25.0.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.11
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Pyenv
• Value of the python.languageServer setting: Pylance

User Settings

languageServer: "Pylance"

testing
• pytestArgs: "<placeholder>"
• pytestEnabled: true

terminal
• launchArgs: "<placeholder>"

experiments
• optInto: ["pythonTestAdapter"]
• optOutFrom: ["pythonTerminalEnvVarActivation"]

Installed Extensions

Extension Name	Extension Id	Version
amazon-q-vscode	ama	1.102.0
aws-toolkit-vscode	ama	3.82.0
base64viewer	Jas	1.5.2
bun-vscode	ove	0.0.31
code-spell-checker	str	4.2.6
codespaces	Git	1.17.5
continue	Con	1.2.10
copilot	Git	1.388.0
copilot-chat	Git	0.32.4
datawrangler	ms-	1.22.0
dbclient-jdbc	cwe	1.4.6
debugpy	ms-	2025.15.2025102001
dependi	fil	0.7.15
docker	doc	0.18.0
edit-with-shell	ryu	1.3.0
EditorConfig	Edi	0.17.4
even-better-toml	tam	0.21.2
font-preview	ctc	2.2.1
git-graph	mhu	1.30.0
githistory	don	0.6.20
gitlab-workflow	Git	6.51.1
gitlens	eam	17.6.2
go	gol	0.50.0
intellicode-api-usage-examples	Vis	0.2.9
java	red	1.47.0
js-debug	ms-	1.105.0
js-debug-companion	ms-	1.1.3
jupyter	ms-	2025.9.1
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.3.0
live-server	ms-	0.4.16
lldb-dap	llv	0.2.18
makefile-tools	ms-	0.12.17
markdown-all-in-one	yzh	3.6.3
markdown-mermaid	bie	1.29.0
material-icon-theme	PKi	5.28.0
mypy-type-checker	ms-	2025.2.0
pdf	tom	1.2.2
pgformatter	bra	1.32.0
prettier-vscode	esb	11.0.0
preview-jp2	ana	0.0.4
python	ms-	2025.16.0
r	REd	2.8.6
r-syntax	REd	0.1.3
rainbow-csv	mec	3.23.0
remote-containers	ms-	0.427.0
remote-explorer	ms-	0.5.0
remote-server	ms-	1.5.3
remote-ssh	ms-	0.120.0
remote-ssh-edit	ms-	0.87.0
remote-wsl	ms-	0.104.3
ruff	cha	2025.28.0
rust-analyzer	rus	0.3.2667
shell-format	fox	7.2.8
shellcheck	tim	0.38.3
swift-vscode	swi	2.12.0
tinymist	myr	0.14.0
vscode-containers	ms-	2.2.0
vscode-conventional-commits	viv	1.26.0
vscode-coverage-gutters	rya	2.14.0
vscode-duplicate	mrm	1.2.1
vscode-edit-csv	jan	0.11.7
vscode-github-actions	git	0.28.0
vscode-h5web	h5w	0.2.0
vscode-icons	vsc	12.15.0
vscode-java-debug	vsc	0.58.3
vscode-java-test	vsc	0.43.2
vscode-js-profile-table	ms-	1.0.10
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
vscode-markdownlint	Dav	0.60.0
vscode-mermaid-chart	Mer	2.5.3
vscode-pgsql	ms-	1.10.0
vscode-pull-request-github	Git	0.120.2
vscode-pylance	ms-	2025.9.1
vscode-tailscale	Tai	1.1.0
vscode-yaml	red	1.19.1
vscodeintellicode	Vis	1.3.2
vsliveshare	ms-	1.0.5959
zip-viewer	ada	3.18.0

System Info

Item	Value
CPUs	Apple M4 (10 x 2400)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: enabled_on trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	3, 3, 3
Memory (System)	16.00GB (0.14GB free)
Process Argv	yoshi
Screen Reader	no
VM	0%

[eleanorjboyd]

will try and repro- thanks

[github-actions]

Because we have not heard back with the information we requested, we are closing this issue for now. If you are able to provide the info later on, then we will be happy to re-open this issue to pick up where we left off.

Happy Coding!

[eleanorjboyd]

Hi! Could you try this again on insiders? I made some efficiency updates which may help. If not can you send a zip of the project which isn't working? Or if you see any difference between the one that works and the one that doesn't (size, characters in path, pytest args etc). Not able to repro this and wanted to get some more specifics

[alanwilter]

I found the culprit: Tinymist Typst extension.
When I disabled that, the issue is gone.

[eleanorjboyd]

aha great! Well reply and I can re-open if it ends up being a bug on our end that is causing this other extension to error